Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Biotite from
Iron Mountain Mines, Iron Mountain, Bartlett, Carroll County, New Hampshire, USA


Locality type:Mine
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Iron Mountain Mines, Iron Mountain, Bartlett, Carroll County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:31991
Long-form Identifier:1:3:31991:7
GUID (UUID V4):0
Nearest other occurrences of Biotite
5.2km (3.2 miles) ⓘJackson Falls, Jackson, Carroll County, New Hampshire, USA
6.6km (4.1 miles) ⓘJackson tin mines, Jackson, Carroll County, New Hampshire, USA
9.3km (5.8 miles) ⓘNorth Moat Mountain localities, Bartlett, Carroll County, New Hampshire, USA
14.7km (9.1 miles) ⓘGovernment pit, Albany, Carroll County, New Hampshire, USA
14.8km (9.2 miles) ⓘBirch Hill, Albany, Carroll County, New Hampshire, USA
15.2km (9.4 miles) ⓘRedstone "Green Granite" quarry, Redstone, Conway, Carroll County, New Hampshire, USA
15.8km (9.8 miles) ⓘLovejoy Gravel pits, Conway, Carroll County, New Hampshire, USA
16.2km (10.0 miles) ⓘRedstone "Red Granite" quarry, Redstone, Conway, Carroll County, New Hampshire, USA
22.2km (13.8 miles) ⓘMillard Chandler Mine, Chatham, Carroll County, New Hampshire, USA
22.4km (13.9 miles) ⓘSwan's Falls locality, Fryeburg, Oxford County, Maine, USA
References
Yuzhou Li (1990): Be-bearing perthitic rock: its alteration attribution and significance in ore exploration. Geology and Prospecting 26(6), 29-35 (in Chinese with English abstract).
 
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